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Desimal: Jurnal Matematika
Published by Universitas Islam Negeri Raden Intan Lampung
ISSN : 26139073     EISSN : 26139081     DOI : -
Core Subject : Education, Social,
Education Mathematics Social Sciences
Desimal: Jurnal Matematika, particularly focuses on the main issues in the development of the sciences of mathematics education, mathematics education, and applied mathematics. Desimal: Jurnal Matematika published three times a year, the period from January to April, May to Augustus, and September to December. This publication is available online via open access.
Arjuna Subject : -
Articles 330 Documents
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Optimization of bantuan pangan non tunai (BPNT) distribution using bilevel linear programming in siantar martoba subdistrict pematang siantar Panggabean, Rijen Riston; Sinaga, Lasker Pangarapan
Desimal: Jurnal Matematika Vol. 7 No. 1 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i1.21868

Abstract

Bantuan Pangan Non Tunai (BPNT) is assistance that is in the second decile; in other words, KPMs who are in the first decile will also get assistance. A limited quota of BPNT recipients will result in people in categories such as the elderly group not getting this assistance. This problem arises because there is a significant increase in the population of the elderly group every year. The research method uses secondary data from data sources, namely the social service office, to develop a bilevel model for the problem of distributing food aid on cash by regularizing the bilevel model so that a linear programming model with a single objective function is obtained. In the regularization stage, the gradient descent method is used to find the optimal value of the penalty parameter. From the calculation results of the regularized model, it is found that the values of the variables  x_1= 2956,  x_2= 583, and x_3 = 250 have a value of Z = 3804. This bilevel linear programming model approach provides a strong basis for planning and decision-making related to the distribution of Non-Cash Food Assistance (BPNT) in Siantar Martoba Subdistrict. Therefore, it can be assumed that this bilevel linear programming approach can be used as a guideline for related agencies in allocating resources efficiently.
Exploration of students' computational thinking skills in solving fractional number problems judging from learning style Sukowati, Berliani Ardelia; Masduki, Masduki
Desimal: Jurnal Matematika Vol. 7 No. 2 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i2.21878

Abstract

Computational thinking skills play an important role in the 21st century in helping students solve mathematical problems. One of the problem-solving abilities of students is influenced by learning style. The purpose of this study is to explore students' computational thinking skills through visual (V), auditory (A), and kinesthetic (K) learning styles. This research uses a qualitative approach with a case study design. This study uses data collection instruments such as test questions, learning-style questionnaires, and interviews. Before being used, the test questions were validated by two mathematics education experts and tested on five grade V students. Using the test results and the learning style questionnaires, the researcher selected three visual students, one auditory student, and two kinesthetic students. Based on the findings of the research, learning style does not affect students' computational thinking capacity. Students with visual, auditory, and kinesthetic learning styles can meet all indicators of computational thinking: abstraction, pattern recognition, algorithmic thinking, and generalization.
Analysis of optimization waste transportation using saving matrix and floyd warshall methods in Binjai Sari, Dinda Permata; Sari, Rina Filia
Desimal: Jurnal Matematika Vol. 7 No. 1 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i1.21887

Abstract

Waste is defined as anything that is not utilized or discarded. Waste is not something that happens by itself; instead, it is a product of human activity. Unresolved problems are often caused by waste. Binjai City's waste problem is one example. In Binjai City, waste transportation is done once a day. The capacity of the truck is only 6–8 m3 or 3-5 tons, so if it is full, the waste is immediately transported to the landfill. Then the collection of waste at each TPS is not possible. Optimization of waste transportation routes using Floyd Warshall and Saving Matrix techniques is one way to overcome this problem. When scheduling cars, the Savings Matrix approach can be used to combine multiple delivery points and take into account the maximum capacity of the vehicle. The Floyd Warshall method is a dynamic programming component that is well suited to solving route optimization problems and can find every potential path between any two locations. Based on an analytical procedure that includes the Floyd Warshall algorithm and the Saving Matrix. These two routes of 29.46 kilometers were first used by the Environmental Agency of Binjai City. 20.63 km is the overall distance when using Saving Matrix, and 23.55 km is the overall distance when using Floyd Warshall. This shows that the Saving Matrix approach is more successful in reducing travel costs and distance.
Scaffolding to reduce misconceptions: A case study of solving a two-variable linear equation system problem based on students' cognitive styles Pramesti, Laorentina Fitri Bella; Setyaningsih, Nining
Desimal: Jurnal Matematika Vol. 7 No. 2 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i2.21957

Abstract

This study aims to explain students' misconceptions in solving material problems of linear equations of two variables before and after scaffolding, the form of scaffolding given, and the effect of scaffolding. The research method used in this study is qualitative descriptive. This research was conducted at MTS Negeri Surakarta 1 with the subjects of 8th grade students who experienced misconceptions. The instrument used in this study is the Group Embedded Diagram Test to classify students based on their cognitive style. Students who experience misconceptions are given scaffolding level 2 (clarify, revise and restructure) and adapted to the needs of the students. Based on the research that has been done, students with a cognitive style of Field-dependent, as many as twelve students; intermediate field, as many as ten students; and depending on the field, as many as five students. Field-dependent students experience classification misconceptions in converting information into a system of two-variable linear equations and correlations in relating their knowledge to problem solving. Independent students experience classification misconceptions when determining the form of a system of linear equations in two variables. The result of this study is that the provision of scaffolding is an effective alternative in overcoming student misconceptions in solving the problem of a two-variable linear equation system.
Application of matrix teaching materials using a problem based learning approach in increasing students' ability to understand mathematical concepts Rohman, Wahyu; Nindiasari, Hepsi
Desimal: Jurnal Matematika Vol. 7 No. 1 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i1.21964

Abstract

Efforts to improve the quality of education continue to be carried out comprehensively, including aspects of knowledge, skills, attitudes, and values. Mathematics learning is understanding mathematical concepts when solving a problem. Therefore, whether or not mathematics learning has been achieved can be demonstrated if students can understand and master a given concept. This research aims to determine the increase in students' ability to understand concepts using teaching materials with a problem-based learning approach. This research used one class with 36 students. Data collection uses observation and tests. The pretest and posttest results show that the posttest results are better, namely having 10.417 points more than the pretest results. The results of the t-test analysis show a significance of 0.000. After being tested, it can be concluded that teaching materials using a problem-based learning approach are effective in improving students' ability to understand mathematical concepts.
Exploration of students computational thinking abilities in solving sequences and series problems based on learning style Sulistiyowati, Dewi; Masduki, Masduki
Desimal: Jurnal Matematika Vol. 7 No. 2 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i2.21971

Abstract

Computational thinking skills play an important role in the 21st century to help students solve math problems. One way in which students' problem-solving abilities are influenced by learning style. This research aims to explore the computational thinking abilities of students studied according to visual (V), auditory (A) and kinesthetics (K) learning styles. This research uses a qualitative method through a case study model. The researcher applies data collection instruments in the form of test questions, learning style questionnaires, and interviews. Based on the test results and the learning style questionnaire, the researcher selected 2 students from each learning style. The results of this study revealed that students with a visual style showed indicators of abstraction, pattern recognition, algorithmic thinking, and generalization. Furthermore, in students with an auditory learning style, indicators of abstraction, decomposition, pattern recognition, algorithmic thinking and generalization emerge. In kinesthetics learning style students, indicators of abstraction, pattern recognition and algorithmic thinking emerge. Based on this, the conclusion obtained is that the difference in students' learning styles has an impact on indicators of computational thinking ability in solving problems related to sequences and series.
Application of negative binomial regression in analyzing factors that influence stunting in toddlers Tamimi, Allifiyani; Husein, Ismail
Desimal: Jurnal Matematika Vol. 7 No. 1 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i1.22070

Abstract

Stunting is a growth and development disorder caused by a lack of nutrition. This research aims to determine the significant factors that influence cases of stunting among toddlers in North Sumatra province in 2022. By using Negative Binomial Regression, we obtained factors that have a significant influence on the incidence of stunting among toddlers in North Sumatra province. The research results obtained show that the variables of the number of toddlers who are given exclusive breastfeeding, the number of toddlers who have inadequate access to sanitation, and the number of toddlers who receive Complete Basic Immunization will have a significant effect on stunting cases in toddlers in Sumatra Province in 2022. This can be seen from the P-values of each variable that significantly influences the incidence of stunting in toddlers: 0.0285 (x1), 0.0525 (x3), and 0.0452 (x6).
Development of problem-based learning-based student worksheet to improve mathematical problem solving ability in rows and rows material Indriani, Ulfa Dwi; Ananda, Rusydi
Desimal: Jurnal Matematika Vol. 7 No. 1 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i1.22105

Abstract

Problem Based Learning is one form of effort to reduce problems in the process of learning mathematics. The model used in the teaching and learning process is in accordance with the demands of mathematics learning and is centered on students. This research has the main objective of developing and designing problem-based LKPD with the aim of improving students' ability to solve mathematical problems on the material of rows and series. The use of the research and development (R&D) model was chosen by researchers in this study. The type of development used in this model is 4D; as stated, 4D itself consists of four stages, namely introduction (define), planning (design), development (develop), and dissemination (disseminate). Problem Based Learning-based LKPD on the material of rows and series developed is feasible to use as teaching material in learning with the acquisition of a validation value of 92.44%, declared practical with a score of 87.44% based on students' responses to student worksheets, and declared effective with student completeness increasing with an N-Gain value of 0.72, including the high category. The increase in students' mathematics learning outcomes on the material of rows and series using Problem Based Learning-based Learner Worksheets shows that there is an increase in the mathematical problem-solving ability of students.
The influence of class management on mathematics learning outcomes in algebraic form material Ulanda, Riska; Siregar, Sakinah Ubudiyah; Pasaribu, Laili Habibah
Desimal: Jurnal Matematika Vol. 7 No. 2 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i2.22127

Abstract

This research aims to find out the effect of classroom management on the learning outcomes of mathematics in algebra form material. The question is whether there is an influence of classroom management on the results of mathematics learning in algebra form material? This research method uses a descriptive approach with a quantitative method by knowing the value of the influence of classroom management on students' mathematics learning outcomes in algebra form material. Data was obtained using a questionnaire. The written questionnaire instrument consists of 10 questions on the influence of classroom management and 10 questions on the results of students' mathematics learning in algebra form material. Data analysis techniques using descriptive statistics. The results of the study show that the value of the influence of classroom management on students' mathematics learning outcomes in the form of material algebra obtained an average percentage of scores of 88.34% and 84.83% in the category of excellent. Meanwhile, the maximum value of the influence of classroom management on the mathematics learning outcomes of class X students is 91.72% and 91.37% in the very good category. This shows that the value of the influence of classroom management has a strong relationship with the results of students' mathematics learning in algebra form material.
Unlocking market insight: Forecasting PT Bank Central Asia Tbk stock prices with ARIMA-GARCH analysis Abidha, Hana Lifa; Ahdika, Atina
Desimal: Jurnal Matematika Vol. 7 No. 2 (2024): Desimal: Jurnal Matematika
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/djm.v7i2.22150

Abstract

Stock prices are very important financial assets and accurate forecasting of stock price movements is of great value in making investment decisions. This research methodology begins with the analysis of historical data of BBCA stock prices. The ARIMA (Autoregressive Integrated Moving Average) model is used to capture trends and patterns of stock price fluctuations that occur over time. This model is then improved with the application of the GARCH (Generalized Autoregressive Conditional Heteroskedasticity) model to measure changes in volatility and heteroskedasticity in stock prices. The data used in this study includes the daily share price of BBCA in the period 1 October 2021 - 30 October 2023, obtained from reliable data sources. This research aims to develop an effective forecasting model for the stock price of PT Bank Central Asia Tbk (BBCA) using a combination of ARIMA and GARCH models. The results of the study show that the closing price of shares of PT Bank Central Asia Tbk (BBCA) contains elements of heteroskedasticity. The best model obtained is ARIMA (0,1,1)-GARCH (6,0). The MAPE value obtained is 0.9610548.

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